- Must have been on stable anti-retroviral therapy for at least 12 weeks with a principal investigator (PI)-based or non-nucleoside reverse-transcriptase inhibitor (NNRTI)-based regimen of at least three drugs, with no intention to change the regimen for the duration of the study; patients who have a high likelihood of better HIV management with a new antiretroviral regimen should defer enrollment until the changes are in place and the new highly active antiretroviral therapy (HAART) regimen meets the 12 week criteria